# Will the speed of the wind produced by a fan increase continously to infinity with the propeller spin speed?

Imagine a scenario: On a stand, an $RC$ plane motor is mounted on a stand. The motor has a $8x4$ prop attached to it. In the theoretical model, if the spin of the motor can be increased infinitely without burning it out,

• will the wind it produces towards the back as the propeller spins always increase or will it plateau over time?

Could you answer this question in the real world. Which means, what would happen in real world taking all phenomena into effect such as friction, air resistance and other related phenomena.

• Whatever the answer, is there an authoritative source that can be provided which I can cite?

Thank You

• The model you are proposing is ofcourse to unrealistic to account for what happens at high rotation speeds. Even if the rotors didn't break at high speeds (which they surely will) you will eventually run into problems with special relativity, limiting the maximum speed. – Mikael Fremling Jan 8 '16 at 9:35
• The question looks fine to me. It's basically asking if there is a maximum speed above which a fan doesn't work, and the answer is yes it's when the blade speed exceeds the speed of sound. – John Rennie Jan 8 '16 at 9:45
• – RedGrittyBrick Jan 8 '16 at 17:00